Submission #102833

#	Time	Username	Problem	Language	Result	Execution time	Memory
102833		daniel920712	Paint By Numbers (IOI16_paint)	C++14	90 / 100	2029 ms	101112 KiB

paint

#include <iostream>
#include <stdio.h>
#include <vector>
#include <utility>
#include "paint.h"
using namespace std;
bool Can[2][200005]={0};
int N,M,ans=0;
bool have[200005][105][2]={0};
bool can[200005][105][2]={0};
int How[200005]={0};
int now=1;
int Big[200005];
int F(int here,int what,int x,string &a,vector < int > &c)
{

    int A,b,i;
    if(have[here][what][x]) return can[here][what][x];
    else if(here==N&&what==M) return 1;
    else if(here==N) return 0;
    else
    {
        if(x==0&&a[here]=='_'||x==1&&a[here]=='X') return 0;
        if(x==0)
        {
            if(here+c[what]>N) return 0;
            if(what==M) return 0;
            if(How[here+c[what]-1]-How[here]||a[here]=='_') return 0;
            have[here][what][x]=1;
            A=F(here+c[what],what+1,1,a,c);
            can[here][what][x]=A;
            if(A)
            {
                //printf("%d %d %d\n",here,what,A);
                Big[here]=max(Big[here],here+c[what]-1);
            }

        }
        else
        {
            have[here][what][x]=1;
            A=F(here+1,what,0,a,c);
            b=F(here+1,what,1,a,c);
            can[here][what][x]=A||b;
            //printf("%d %d %d %d\n",here,what,A,b);
            Can[x][here]=can[here][what][x]||Can[x][here];
        }
    }

    return can[here][what][x];
}
string solve_puzzle(string s, vector < int > c)
{
    int i,j,big=-1;
    N=s.length(),M=c.size();
    for(i=0;i<N;i++)
    {
        if(i) How[i]=How[i-1];
        How[i]+=(s[i]=='_');
        Big[i]=-1;
    }
    F(0,0,0,s,c);
    F(0,0,1,s,c);
    for(i=0;i<N;i++)
    {
        //printf("%d ",Big[i]);
        for(j=max(big,i);j<=max(big,Big[i]);j++) Can[0][j]=1;
        big=max(big,Big[i]);
    }
    //printf("\n");
    for(i=0;i<N;i++)
    {
        if(Can[0][i]==0) s[i]='_';
        else if(Can[1][i]==0) s[i]='X';
        else s[i]='?';
    }
    return s;
}

Compilation message (stderr)

paint.cpp: In function 'int F(int, int, int, std::__cxx11::string&, std::vector<int>&)':
paint.cpp:23:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
         if(x==0&&a[here]=='_'||x==1&&a[here]=='X') return 0;
            ~~~~^~~~~~~~~~~~~~
paint.cpp:17:13: warning: unused variable 'i' [-Wunused-variable]
     int A,b,i;
             ^

• Subtask 1: 7 / 7
• Subtask 2: 3 / 3
• Subtask 3: 22 / 22
• Subtask 4: 27 / 27
• Subtask 5: 21 / 21
• Subtask 6: 10 / 10
• Subtask 7: 0 / 10